enh: align coreg boldref with fmriprep

[mgxd]

nipreps/fmriprep#3668

[codecov]

Codecov Report

❌ Patch coverage is 76.64671% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.45%. Comparing base (790b872) to head (e61e1e6).

Files with missing lines	Patch %	Lines
nibabies/workflows/bold/coreg.py	71.42%	21 Missing and 9 partials ⚠️
nibabies/utils/derivatives.py	85.10%	3 Missing and 4 partials ⚠️
nibabies/workflows/bold/outputs.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
+ Coverage   63.29%   63.45%   +0.15%     
==========================================
  Files          73       73              
  Lines        7168     7226      +58     
  Branches      884      893       +9     
==========================================
+ Hits         4537     4585      +48     
- Misses       2362     2368       +6     
- Partials      269      273       +4     

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